Navistar International DT 466 Diagnostic/Troubleshooting Manual page 420

416 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
DTC 368
EGR drive module/ECM communication fault
• DTC 368 is set by the ECM when CAN 2 datalink
communications are not received from EGR drive
module.
• DTC 368 can be set for the EGR drive module due
to the following conditions:
If engine starts and runs, the DTC is specific to
the EGR drive module and ECM communications.
The following are possible causes:
- An open or short to ground on the power circuit
exists.
- An open or short to power on the ground circuit
exists.
- CAN 2 positive and CAN 2 negative are both
open or high resistance exists.
When CAN communication is not present from the
EGR drive module, the ECM sends 100 percent
EGR position to the EST.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
If a no start condition exists with DTC 368 and 543
active, check the CAN 2 wiring (EGR to ECM and
IDM to ECM). See "ECM / IDM Communications"
(page 373). One of the CAN 2 datalink wires (CAN
2 positive or negative) is open, short to ground, or
short to power exists.
• When DTC 368 is active the amber ENGINE lamp
is illuminated.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• EGR Valve Breakout Harness
• 12–pin Breakout Harness
• Breakout Box
• Terminal Test Adapter Kit
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.